To perform the project above, I made archival studies in UK (4 times, mainly at the Library of Science Museum) and at Biblioteque National of Paris. In this process, it became clear that I should focus on the emergence of brass-making technology (the crucial material for instruments), and the formation of the craftsman tradition for scientific instrument making.The result of the research is the following :1.England was dependent on imported continental brass until the midst of the seventeenth century, and then immigrant craftsmen implanted its technology around 1650s. Domestic production of the brass was achieved in the latter half of the seventeenth century mainly near Bristol.2.The first group of instrument makers was also immigrant. They were specialized in engravings and also naval instruments, both of which were based on brass technology. At first, they belonged to the Grocer's Company, and gradually moved to the Clockmaker's Company after its establishment in 1631.These facts strongly suggest that the origin of Hooke's instruments was engravings which had much to do with naval instruments through brass technology. This tradition merged into clock-making, which I supposed to be the origin of Hooke's instruments when the research project was started.